'Joined' in the Bible

There were Hebrews from the area who had gone earlier into the camp to join the Philistines, but even they joined the Israelites who were with Saul and Jonathan.

When all the Israelite men who had been hiding in the hill country of Ephraim heard that the Philistines were fleeing, they also joined Saul and Jonathan in the battle.

So David left Gath and took refuge in the cave of Adullam. When David’s brothers and his father’s whole family heard, they went down and joined him there.